I have not observed any evidence that I need to use a circular polarizer with
an OM-4T. If I use the camera to spotmeter an area of a scene without the
filter on, and then attach the filter and re-meter the same area, I get
a difference in meter readings corresponding to the loss of light
due to the filter factor. Thus, I have not been able to observe an
effect on the accuracy of taking a meter reading, hence I don't know
what is meant by the circular polarizer affecting manual exposure.
It was already mentioned that for OTF exposures, it is irrelevant.
Could someone give a reason why a circular polarizer is needed,
or some evidence that it is other than just saying it says so in
some FAQ somewhere?
Joseph
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